Island



C. D. STARR.

STOVE GBATE.

APPLICATION FILED JUNE 1. 191a.

Patented Nov. 18, 1919.

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7 I. i AM 5 lilfllllil" l V/ TN/iSSES rrm) srATEs PATE CLARENCE D.STARR, OF PROVIDENCE, RHODE ISLAND, ASSIGNOB, '10 BARSTOW STOVE COMPANY,OF PROVIDENCE, RHODE ISLAND, A. CORPORATION OF RHODE ISLAND.

STOVE-GRATE.

Specification of Letters Patent.

Patented Nov. 18, 1919.

Application filed. June v, 1919. Serial No.302,4=62.1

1/ b all whom it may concern:

Be it known that LHOLARENGE D. STARR, of Providence, in the county ofProvidence and State of Rhode Island, have invented certain new anduseful Improvements in Stove-Grates; and I do hereby declare thefollowing to be a full, clear, and exact description of the same,reference being had to the accompanying drawings, forming a part of thisspecification, and to the reference-numerals marked thereon.

Mypresent invention relates to stoves and more particularly to gratestherefor and it has for its object to provide an improved form of grateand grate bar that will prop-- erly support a bed composed of eitherlarge or small coals and that will effectively separate and dump ashesat the bottom of'the bed without unduly agitating the latter or causingit to cave or follow the ashes through. A further object of theinvention is to provide a grate bar that will not jam and that will beeffective in breaking up and passing clinkers. To these and other endsthe invention resides in certain improvements and combinations of partsall as will be hereinafter more fully described, the novel featuresbeing pointed out in the claims at the end of the specification.

In the drawings:

Figure l is a top view of a grate con structed in accordance with andillustrating one embodiment of my invention;

Fig. 2 is a transverse sectional view there through and through the firepot of a stove with the grate bars in normal position;

Fig. 3 is a similar view showing the operation of the bars, and

Fig. 4 is a similar view of a modified coupling of the bars.

Similar reference numerals throughout the several views indicate thesame parts.

Features of the invention are applicable to stoves, ranges and furnaces,but I have illustrated in the present instance, a grate for rangescomprising a frame 1 having bearings at 2 and 3 for the trunnions t andshafts 5 of two parallel grate bars 6. The bars are symmetrically formedand each comprises a pair of oppositely arranged blades 7 of the samediameter, each of which blades has a headed portion 8 formed by undercutportions 9 at the sides that produce oppositely faced hook-shapedcutters. Similarly oppositely arrangedblades 1O located intermediate theblades 7 so as to alternate therewith are of a reverse conformation,that is, they taper toward their outer ends instead of being enlarged.Such groups of blade elements are repeated in the construction along thelength of each grate bar, in the usual manner and as shown in Fig. 1.The shafts 5 of the bars carry intermeshing gears 11 so that the barsare connected to move in unison and in opposite directions or towardeach other when either is turned as by the usual crank (not shown)applied to the squared end 12.

With the bars in the positions of Figs. 1 and 2, the coals rest largelyupon the blades lOand part of the ash forms a pocket between the blades7. When the bars are rotated, these last mentioned blades travel towardeach other, as shown in Fig. 3, and pinch off the ash pocket while theblades 10 that are juxtaposed, reccde from each other and allow the ashto fall through. The hook-shaped portions or cutters on the heads 8operate to divide or crush any clinkers that may be present, while thelaterally arranged tapered blades 10 agitate the lateral pockets of ashnear the bricks 13 and if clinkers are present here, they are lifted androtated into position to be engaged between the next succeeding pair ofblades 7. The amount of ash that can be pinched oil in this manner isconsiderable and yet at no time is a very large opening left between thegrates that could seriously disturb the bed of coals above.

Substantially the same action takes place if the bars are rotated in theopposite direction away from each other, except that the cutters on theheads are forced toward the bricks instead of toward each other. Ifdesired, the bars may be left independently movable with the gears 11omitted, in which case only half of the ash pocket would be removed at atime by a given blade. Any number of grates may be used, of course,according to the size of the [ire box. Enough space is left at all timesbetween the blades for fine ash to fall between, though the fuel isprevented from doing so in whatever po sition the grates are left. Forsuch reasons. the grate bars are particularly useful when no gearing isused and each is free for inde' pendent movement.

I claim as my invention:

1. A grate bar embodying oppositely an ranged blades having undercutheaded portions forming opposltely faced hook shaped cutters incombination with intermediate fuel supporting m m ers extendinglaterally beyond the headed portions of the blades.

2. A grate bar embodying oppositely arranged blades having undercutheaded portions in combination with oppositely arranged intermediateblades tapered toward their outer ends.

3. In a grate, the combination with two parallel grate bars eachembodying oppositely arranged blades having undercut headed portions andoppositely arranged intermediate blades tapered toward their outerends,'0f gearing connected to move the grate bars in unison toward eachother While maintaining their respective pairs of correspondingly shapedblades at the same angle to the plane of the grate.

CLARENCE D. STARR.

